3.6/ipad news category changes updates

*Fixed story next image size
*Fixed Loading / No Results / Failed view for search
*Changed some NSOperationQueue blocks to dispatch_async
*Merged loadingMore and failed cells into loadMore cell by making the text label editable
*Changed return: to completion:
*Combined some CategoryGrid and List logic 
*Error Message now displayed instead of “Failed”
*__weak reference instead of tags
*searchbar cancel button is separate from search bar so cancel button is properly enabled when search bar is no first responder
*updates for iPhone’s status bar
*added refresh controls for gird and list view
*grid icon updated